Illuminating appliance.



O. A. MYGATT.

ILLUMINATING APPLIANCE.

APPLICATION FILED 111NE11..1912.

Patented Apr. 11, 1916.

WITNESSES INVENTQR 4 W. 1 W644 Q 1 dos/K Crow/e M warren snares PATENT carton.

OTIS .A. MYGATT, or NEW YORK, N. Y., ASSIGNOR TOYHOLOPHANE GLASS COMPANY,

OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEV Original application'filed April 25, 1907, Serial No. 370,201. Divided and this application filed June 11,--

Specification of Letters Patent.

Patented April, 1916.

1912. Serial No. 703,098.

. T 0 all 'whom it may concern:

invented a certain new and .useful Illuminating Appliance, of which "the following is a specification.

My invention relates to illuminating appliances. and its object is to provide in an appliance which constitutes an operative unit, means for regulating the quahtity, distribution, and also the quality of light rays reflected from a source of artificial light.

This application a division of application No. 370,201, filed April 25, 1907.

I obtain this result by using a reflecting appliance in which specular reflecting surfaces are combined with light-radiating reflQClZlll" surfaces arran ed in various VVFIVS...

and relationships.

Reflectors in general use at the present time may be classified as (1) specular refiectors, of which prism glass is an example,

and (2) light radiating or diffusing reflectors (which reflect chiefly because of their color properties), of which opal glass is an example.

Hereinafter, for the sake of brevity, reflectors or reflecting surfaces of the first class will in some cases be called specular, and those of the second class, colored. Certain quantities of each of these classes of reflectors, and certain disadvantages of each, which my invention obviates, will now be briefly pointed out: Light rays are reflected 'by specular reflectors in definite directions,

and these reflectors may be constructed to give almost any desired light distribution, within reasonable limits. The reflective results are due in part to the shape of the reflector body and in part to the con-formation of the reflecting surfaces themselves (for example, the prismatic surfaces of prismatic glass reflectors). Light rays directed by specular surfaces are, however, comparatively harsh, and in practice there is requently an undersirably sudden varia- Jon in the outline of the theoretically cor- .cct curve of distribution, the causes of which are well understood by those versed in the art, and need not be particularly referred to here. When'the specular reflector consists of prism glass a certain amount of light passes through the reflector and the amount of light thus passing upwardly is frequently greater than is desirable for proper illumination of ceilings.

reflected depends mainly on the color of the reflecting material, and upon the surface finish of such material. l light rays reflected by these reflectors are not sharp and definiteas when reflected from a specu-,

lar surface, but are more or less blended, dlfl'used and softened. These reflectors have little or no ability to concentrate, distribute or control the direction of light rays H which they reflect.

Bvcombining in a single structure "specular and colored reflecting mediums I com-" bine the advantages and eliminate the disad 'antages of the distinct forms described. By this means I am enabled to produce a single reflecting appliance which distributes light definitely according to a predetermined plan and also radiates or diffuses a portion of the light rays, these diffused rays mingling with those reflected by the specular surfaces so that the combined reflected light is softened and at the same time distributed in the desired manner.

, The reflectors may be made of other material. than glass, and the reflecting surfaces may widely vary, but I have found that my invention may be embodied in prism glass combined with opal glass to better advantage than in any other form. As a specific illustration of the invention I have accordingly shown this form in the drawing.

The figure is a cross section of ance embodying my invention.

In the figure is shown an arrangement consisting of a light source such as an incandescent light filament L, an inner prism glass reflector S and an outer opal or. otherwise colored reflector C. The inner reflector is the specular member and the outer reflector the non-specular member. The principal partof light rays R falling upon the inner surface of reflector S strike the prisms-and are reflected back and from the mouth of the reflector, as indicated by por tion R ,in the usual manner. A part of the rays, however, pass through the specular body as at R and encountering the colored outer reflector C are broken up and radi- In color reflectors the quantity of light 60.

an appliated downwardly between the tworeflectors, as indicated at R in e diffused and softened condition. Rays R pass below reflector S and encounter only the colored reflector C,

and are reflected in diffused rays R to inin-v gle with other light rays.

In the foregoing detailed. description prism glass has been described as constituting the specular member, and opalized glass the colored'member. Instead of these particular forms and materials, howe fer, widely different devices may be substituted.

While White or opalescent tints probably give, the best results as non-specular reflecting mediums, other colors and tints possess the same properties to a varying degree, and the glessor other reflector body may therefore, if desired, be given other than White or opalescent tints to produce the light difi. fusing reflecting member. I

i For the purpose of describing this inveir' i tion, the illuminating appliance hasbeen illustrated in a pendant'position, but it is not limited to the pendant position, and can He used in an upright or any other position.

What I claim is:

1. In. 2!, light modifying appliance, an

outer diffusing reflector and. an inner specu ier reflector, the latter being spaced apart from thedifiusing reflector and comprising means for transmitting light uniformly over the'inner surface of said diiiusing reflector.

2. In a light modifying appliance, an openmouthed outer difi'using reflector and an open-mouthed inner specular reflector spaced apart from the difiusing reflector and di- I face of the said. diffusing reflector.

4:. A light, modifying appliance comprising an outer diffusing reflector and an inner open-mouthed prismatic reflector spaced apart from the difi using reflector.

OTKS t. MYGAUJITIY Witnesses:

JNO. B. LIBE MAN, LUCIEN MEMMINGER 

